In Call of Duty: Modern Warfare 2, two stun grenades are now given instead of one. Wearing a Blast Shield negates the slowing and blinding effect of stun grenades, giving Blast Shield wearers a significant advantage in indoors fighting. The same benefit is received for the Riot Shield.

The Stun Grenade returns and retains the same purpose from previous games. However, the player can now double tap the Action Button to detonate the stun grenade manually, similar to C4 in previous games. The Stun Grenade can also disable Remote Turrets for a short period of time, allowing most tactical players to destroy Turrets with ease. Players with the Tier 3 Perk, Hard-Wired, however have immunity to the Stun Grenade.